uPVC Double Glazed Windows & Doors in Ballarat
by SimonPublished: September 2, 2026 | Updated: September 23, 2026Regulations & Planning7 min read

Melbourne’s outer suburbs run into bushland, and once a property sits inside a designated bushfire prone area its doors become a compliance decision as much as a style one, governed by Australian Standard AS 3959.

Bushfire Attack Level, or BAL, is the number that drives it. It is often read as a product label when it really measures what a site is likely to face.

Table of Contents

Key Takeaways

  • A BAL rating describes a site’s bushfire exposure, not a product. Doors are built or tested to suit it.
  • New homes in a Victorian designated bushfire prone area are built to a minimum of BAL-12.5.
  • Requirements tighten in steps: glazing moves from 4 mm to 5 mm to 6 mm, screening becomes mandatory, and frame options narrow.
  • At BAL-40, frames must be metal and screen mesh must be corrosion resistant steel or bronze, not aluminium.
  • Ask a supplier for a test report naming the door system and its tested BAL level.

What BAL Actually Measures

BAL measures the radiant heat a building is predicted to face in a bushfire, expressed in kW/m2, along with the likelihood of ember attack and flame contact. It comes from the vegetation near a site, the slope of the land and the distance between them, which is why double glazing installers in Melbourne cannot tell you a rating from a photograph. AS 3959 sets six levels.

  • BAL-LOW: risk too low for specific construction requirements.
  • BAL-12.5: ember attack and radiant heat up to 12.5 kW/m2.
  • BAL-19: 12.5 to 19 kW/m2, with increasing ember attack.
  • BAL-29: 19 to 29 kW/m2.
  • BAL-40: 29 to 40 kW/m2, with flame contact more likely.
  • BAL-FZ: above 40 kW/m2 and direct exposure to flames.

Bushfire Zones Around Melbourne

Two mapping layers matter on the city’s fringe. A designated bushfire prone area is mapped under the building system and covers much of the Dandenong Ranges, Yarra Ranges, Macedon Ranges and the bushier parts of the Mornington Peninsula. New homes built in one go to a minimum of BAL-12.5. The Bushfire Management Overlay is a planning control over land with very high and extreme hazard, adding a planning permit and often a CFA referral. Overlay land is bushfire prone by default, but plenty of bushfire prone land is not, so check your address with council.

Site Rating Versus Assembly

A property is rated; a door is specified to suit it. There is no BAL-29 door in the abstract, only door assemblies with evidence that they perform at BAL-29.

AS 3959 gives two routes. The first is deemed-to-satisfy construction, building the door to the prescriptive material, glazing, screening and sealing rules for the level. The second is a tested system, assessed as a whole assembly to AS 1530.8.1 for BAL-12.5 through BAL-40, or AS 1530.8.2 for BAL-FZ. A compliant bushfire shutter is a third.

Door Requirements By Level

These deemed-to-satisfy requirements apply to external doors and tighten at each level. Read them before shortlisting a double glazed door range, because the rating decides the material as much as the look does.

BAL-12.5 External Doors

Side-hung doors must be non-combustible, solid timber at least 35 mm thick for the first 400 mm above the threshold, hollow core with a non-combustible kickplate over that same 400 mm, or fully framed glazed doors. Glazing is Grade A safety glass at least 4 mm, and doors must be tight fitting with weather strips or draught seals at the base. Frames may be bushfire resisting timber, timber of 650 kg/m3 or greater density, metal including aluminium, or metal reinforced uPVC.

BAL-19 External Doors

Panel and frame options are as for BAL-12.5. Glazing steps up to toughened safety glass at least 5 mm. Exposed external hardware must be metal, base seals remain mandatory, and screening is still not required.

BAL-29 External Doors

Glazing moves to toughened glass at least 6 mm. Glazing within 400 mm of the ground, a deck or a low-pitched roof must be screened externally with mesh of maximum 2 mm aperture in corrosion resistant steel, bronze or aluminium. Hollow core doors must be screened. Frames narrow to bushfire resisting timber, metal, or metal reinforced uPVC.

BAL-40 External Doors

Frames must be metal, so timber and uPVC are out at this level. Glazing is toughened glass at least 6 mm, and both fixed and openable glazed portions must be screened externally in corrosion resistant steel or bronze mesh, so aluminium drops out too. Seals to stiles, head, sills and thresholds must be silicone or a material with a flammability index no greater than five.

BAL-FZ External Doors

A flame zone door system must be tested to AS 1530.8.2 from the outside, achieve a fire resistance level of at least -/30/-, or be completely protected by a compliant bushfire shutter. Few residential door systems carry that evidence, and flame zone work belongs with a bushfire consultant from the design stage.

Frames, Screens and Seals

Three components decide whether an assembly holds up, each with its own rules.

Frame Materials

AS 3959 lists metal reinforced uPVC among the acceptable deemed-to-satisfy frame materials up to BAL-29, and excludes it at BAL-40 and BAL-FZ. Being on that list is not the same as a product being compliant. Standard uPVC frames are not bushfire rated by default, and reinforcement, glazing, hardware and seals all have to meet the level together, so ask for paperwork covering the exact system.

Screen Mesh

Where screening is required, mesh or perforated sheet has a maximum aperture of 2 mm and the screen frame must be metal or bushfire resisting timber. Insect and pet mesh does not qualify. The 2 mm limit is there to stop embers, which is why screens are fitted externally.

Seals and Thresholds

Sealing is often overlooked. Doors must be tight fitting to the frame and to any abutting door, with weather strips or draught excluders at the base, and those strips need a flammability index no greater than five under AS 1530.2. On sliding, French, bi-fold and stacking doors, every track and meeting stile adds another gap to close.

Replacing Doors in Renovations

Bushfire requirements attach to building work, so whether they apply to a straight swap depends on the scope and your building surveyor’s assessment. Alterations and additions in a bushfire prone area commonly attract requirements for the new work. Confirm the BAL, then what your scope triggers, then specify. A wide opening is where sealing gets hardest, so raise it early if you are weighing up sliding patio door replacements or a stacking system.

FAQs

Common questions from homeowners and builders on Melbourne’s fringe.

Does a BAL rating apply to my door or to my property?

To your property. The BAL describes a site’s bushfire exposure. Doors are then specified to suit that rating, either through the deemed-to-satisfy rules in AS 3959 or a system tested to AS 1530.8.1 or AS 1530.8.2.

Are uPVC doors allowed in a bushfire prone area?

Metal reinforced uPVC appears among the acceptable deemed-to-satisfy frame materials up to BAL-29, and is excluded at BAL-40 and BAL-FZ. That does not make a particular uPVC door compliant, because the whole assembly has to meet the level. Ask for evidence covering the system quoted.

Do I need screens on an external door at BAL-29?

Glazing within 400 mm of the ground, a deck or a low-pitched roof must be screened externally, and hollow core doors must be screened. The mesh has a maximum aperture of 2 mm in corrosion resistant steel, bronze or aluminium.

Who works out the BAL rating for my block?

An accredited BAL assessor or suitably qualified consultant, using the method in AS 3959. The rating is confirmed through the building permit process, and a Bushfire Management Overlay adds a planning permit and often a CFA referral.

Does replacing an old door trigger bushfire requirements?

It can. The requirements apply to building work in a designated bushfire prone area, and your building surveyor decides what a scope triggers. Settle that before ordering.

Getting The Specification Right

Compliance comes down to three things: the site’s rating, the pathway between prescriptive construction and a tested system, and evidence for the assembly installed. Start with your BAL report and building surveyor, then take the level to your supplier and ask what they can evidence at it. Requirements here come from AS 3959 and change between editions, so confirm the detail against the current standard.

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Simon

Simon is part of the Double Glazing Melbourne team, working with homeowners across Victoria to improve comfort, energy efficiency, and noise reduction through double glazed windows and doors. He supports clients in finding suitable uPVC window and door solutions based on their property, preferences, and local conditions. Simon focuses on practical outcomes, helping homeowners feel more confident about their choices when upgrading or replacing existing windows and doors.